Safety guard for centrifugal extractors



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March 2 1926. LEY-l T. A. BRYSON SAFETY GUARD FOR CENTRIFUGAL EXTRACTORSFiled Feb. 18. 1921` 3 Sheets-Sheet 2 @mue/nto@ M u a March 2 1926. v1,575,316

lT. A. BRYSON SAFETY GUARD FOR CENTRIFUGAL EXTRACTORS Filed Feb. 18.1921 s shees-sheet s 96 i' s 96 ii f/oe 99g\ I( 1 87 az so 1"/0/ loo 184 7 V Y 'iwf' 1 1 l 45 5o mz (m5 94 lo@ Patented Mar. 2, 1926.

UNITEDy STATES Parelxir OFFICE.

TANDY A. IBRYSON, OF TROY, NEW YORK, ASSIGNOR TO TOIiI-IURST. MACHINEWORKS, A CORPORATION OF NEW YORK.

SAFETY GUARD ron CENTRIFUGAL nxrnacrons.

Application 'filed February 18, 1921.

To all /wLm/t t may concern.'

Be it known that I, TANDY A. BRYsoN, a citizen of the United States,residing at Troy, in the county of Rensselaer `and State of New York,have made certain new and useful Improvements in Safety Guards forCentrifugal Extractors, of which the 'following is a specification.

The invention relates to safety guard devices for centrifugal extractorsand more especially to novel devices of the kind wherein the guardautomatically closes when the machine begins to rotate,.is kept closedby the rotation of the machine, and is releasable for opening only afterthe machine has stopped rotating. Y y Y Objects and advantages of theinvention will beset forth in part hereinafter and in part will beobvious herefrom, or may be .learned by practice with the invention, thesaine being realized and attained `by means of the instrumentalities andcombinations pointed out in the appended claims.

rihe invention consists in the `novel parts,

' constructions, arrangements, combinations and improvements hereinshown and described.

The accompanying drawings, referred to herein and constituting a parthereof, illustrate one embodiment of the invention, and together withthe description, serve to explain the principles of the invention.

Of the drawings Fig. l is a central, vertical section through acentrifugal extractor embodying the invention, and showing the guardlocked in closed position;

2 is a fragmentary elevation, showing the guard latched in the openposition;

Fig. is a fragmentary top plan of the hinge mounting on the casing forthe guard, as indicated by line of Fig. l;

F ig. d is a horizontal section taken on line 4 4 of F ig. Vl, showingthe guard controlling mechanism in the open position by dotted lines,and by solid lines in the guard closing and locking position;

Fig.v 5 is vafragmentary vertical section, on an enlarged scale, of alocking device for the guard latchlever;

Serial No. 446,017.

Fig. 6 is a fragmentary elevation, on an enlarged scale, of a differentform of locking device for the guard latch operating bar;

Fig. 7 is a horizontal section on line 7 7 of Fig. 6;

Fig. 8 corresponds to Fig. 6 but shows the parts in unlocking position;

Fig. 9 is an enlarged detail in elevation, and in section on 9 9, ofparts shown in Figs. 6 to 8; and

Fig. l0 is a detail of the upper left-hand parts of Figs. 6 and 8,showing the spring locking action.

The invention is shown applied to a solid curb or open top centrifugalextractor, and in certain aspects of the invention it is especiallyapplicable to that type of machine, while in certain of its features itis applicable also to otherkinds of centrifugal extractors. y

In the exemplified and present preferred embodiment, the inventioncomprises as its main features a basket guard which is held or latchedin open position against the action of gravity, and cooperatingtherewith guard controlling mechanism which releases the guard so thatthe guard, merely by being released, will drop to the closed position.At the same time the guard controlling mechanism is automatically lockedso as to prevent the guard being opened until the extractor has ceasedrotating. The releasing and locking are effected by positive movement ofthe mechanism.

More particularly, in said present preferred embodiment, a latch leveris provided with a detent to hold up the open guard against gravity. Aslidable bar is moved by the basket shaft to free thelatch lever fromits detent, thereby permitting the guard to drop to the closed position,and, the bar at the same time passes into locking position with thelatch lever to lock the guard in closed position. In said embodiment, itwill be understood, the guard closing and locking `devices are alsooperated directly and positively from the basket and shaft and do* notdepend onany ancillary or secondaryconditions or operations of themachine.

It. will be understood that this preliminary general description isexplanatory and not restrictive of the invention, and thatV otherfeatures of the invention will be first set forth in connection withthefollowing full detailed description.

Referring now lin full detail to the embodiment of the inventionillustrated by way of example in the accompanying ,draw-y ings, a casing1 is shown of the solid curb type, with the top opening of the casingand of the enclosed basket unobstructed, the drive being from beneath.The casing 1 is mounted on a frame 2, shown as of tripod form. Enclosedwithin the casing 1 is a basket 3, provided with a central portion 4L,supported upon andfixed to the upper end nof a shaft 6, which shaft isprovided at its lower end with a belt pulley 7. The shaft G is supportedin ya suitablebearling 8, the bearing being carried by the part 9 of thebottom of the casing 1. vThe parts so far as shown and described aremore or less conventional in character, as various known or suitableconstructions may be employed.

By the present invention, a guard 15 closing the entire top opening ofthe casing is provided, and is shown as a flat cover, preferably of wiremesh or other open construction, and of circular form to litvover and toclose the opening 16 in the top of the casing and also thereby theopening 11` in the top of the basket. The guard closure 15 -is shownwith its edges bent around a stiffening and supporting` rod 17. Meansare provided for raising the closure 15 and holding it in raised or openposition, as shown in Fig. 2, to give free access to the openings in thetop of the casing and of the basket. ln accordance with one feature ofthe inventio-n, as previously indicated, the closure 15 is held in suchposition that when released it will fall to the closing or safe positionof Fig. 1 by the action of gravity.

As embodied, a hinge support or mounting for the closure 15 is fixed ator near the top outer peripheral edge of the casing l, the hingemounting comprising a leaf or plate 1S fastened to the closure 15 bysuitable fastenings, such as bolts or rivets 19, which pass through thehinge, the guard and through a reenforcing plate 24 on the inside of theguard. The hinge leaf 18 is pivotally mounted on a pin or rod 20,carried in lugs 21, which are formed on a curved plate 22, extendingdownwardly along the outer surface of the casing 1, and fastened theretoin suitable manner, as by screw bolts 23. From the hinge leaf 18 thereprojects outwardly a lever 27, to which lever the guard-controllingmechanism is connected, and through which 'the closure is operated andcontrolled. An adjustable stop 23 is provided for limiting the upwardmovement of the guard 15, positioning itso that it will be dropped bygravity into closed position when the basket begins to rotate. Thepositioning operation of this stop is shown in Fig. 2.

Referring now in detail to he present preferred and illustratedembodiment of the control mechanism for the safety guard or closure itis especially adapted to a bottom drivenv extractor, although theinvention is applicable also to top driven or suspended machines aswell. Said control mechanism comprises a latch lever 29, pivoted at 30to the hinge lever 27, and extending downwardly outside the casing 1.Latch lever 29 at its bottom end is provided with a notch 32 adapted tocooperate with a detent 33, which fis supported on the machine frame,and is adapted to hold the safe ty guardv or closure in open position asshown in Fig. 2. Y

Further, asembodied, the latch lever 29 is provided at its'bottom endwith a stop or contact surface 34, which is adapted to cooperate withthe other parts of the safety mechanism to hold the guard in the closedor safe position as shown in Fig. l. A spring 35 is preferably providedto yieldingly 4impel latch lever 29 inwardly to effect or to aid in itscooperation and coaction with the detent 33 and with the lockingmechanism described hereinafter. Spring 35 is in tension and has one endhooked into latch lever 29 and the other end hooked into a bracket 36fixed on the casing 1 of the extractor. The detent 33 is mounted upon aframe or support. 39 carried upon and extending across between legs 37and 3S of the machine frame, and being fastened thereto in suitablemanner,l asv by .screw bolts 40. The frame or support 39 is providedwith a 'guide 12 for the latch lever 29, which holds it in alinementagainst possible transverse displacement, and limits its out wardmovement, the frame 39 limiting its inward movement.

The remaining portions of the guard control mechanism, as embodied,comprise means or mechanism, called into operation by the extractorbeginning to rotate, which releases the latch lever 29 from thedetent 33and, after the guard 15 is in the closed or safety position, thereafterholds or locks the latch lever so that the guard may not again be openeduntil the extractor has stopped rotating and has come to rest.

In the embodied form of said means, a rod or barr 50 is supportedk atone end in the frame 2 and at the opposite end in the frame piece 39,bar 50 thereby having Alongitudinal movement to release the latch lever29 from the detent 33 and then to hold or lock the latch lever 29 inclosed or safe position. The end of lever 50 is shown beveled at 5l toform a nice operating lit to pass beneath and then lock the end 34 ofthe latch lever. The rod or bar aty its opposite end is provided with ahand piece 52 whereby the bar is drawn backwardly, or to the left inFig. 1, in the manual release or unlocking of the safety device, whichis possible after the basket has come to rest.

Referring now to the embodied form of mechanism for actuating the bar 50in the manner indicated to close and to then lock the guard in safeposition, the rod or bar 50 is not continuous, but is provided at itscentral portion with an lopen fiume 53, which is yoked about the shaft6, the bar 50 extending along or .substantially in alinement with adiameter of the shaft G The yoke frame 53, as shown, comprises twoangled side pieces 48 and 49 fastened to the ends of the two parts ofbar 50 by bolts 47. The `hub 54 of the pulley 7 extends upwardly withinthe voke frame and is provided with a horizontally disposed, outwardlyprojecting cam 55, which engages with yoke 53 to slide bar 50, as laterdescribed. 'v

For the purpose of locking bar 50 `with its right hand end in .holdingor loci-.ing cngagement with the bottom of latch lever 29, there arefixed on the bar 5() two lugs 56 and 57, with an open spacetherebetween. Mounted upon the adjacent leg 5S of the frame 2 are twolugs or brackets 59 and G0, in which are jourualed a swingablelocking'bail 61. A lever arm 62 is fined to one end of the bail 61,whereby it may be rocked by hand out of locking position.

Means are provided by the invention for further or doubly guardingagainst any possible manual release of the bar or rod 50 while the shaft6 may be rotating very slowly just before coming to rest, that is, toprevent bar 50 being drawn to the right during the time elfispingbetween the cam leaving the right hand end of yoke 53 and itsre-engagement therewith. As embodied, for this purpose, a retardingdevice is applied to bar 50, whereby the withdrawal of the bar to itsguard-releasing or unlocking position is rendered relatively slow, .andthis retarding action is regulated so that the latch lever 29 could notpossibly be released from the bar 5() in the portion of a revolution ofthe shaft 6 in which the cam 55 would be positioned so as to permitthis. The embodied form of reta rding device comprises a dash potmechanism, including a cylinder 66 mounted on a bracket 67, and providedwith a suitable piston 68 thcrewithin, having a piston rod extending outfrom the open end of the cylinder, and connected to the bar 50 by abracket 71. The opposite end of cylinder 66 is closed and is providedwith an air vent 72. Thus the retraction of bar 50 to the lett in Fig. 1is retarded this will be prevented by the cam 55 on each sufficiently soas to insure the guard from being unlocked until the shaft 6 has come torest. It will usually be found unnecessarv, however, vto use theretarding device in most installations. 1 j.

The manner of operation of the embodied mechanism as described, issubstantially as follows:

It may be assumed that the mechanism is. in the position of F ig. 2,with the guard l5 held open, and permitting free access to theextractor, the guard being inclined so that it will fall into closingor' safe position by the action of gravity, lt is held from falling,however, by the .rotoli or latch 32 being in engagement with the detent39, to which engaging position it is iinpelied by the spring 35. At thistime the locking bail 61 is lying on top of lug 5G, and rod 50 is in theretracted or left-hand. position, as shown in Fig. 2, and as shown indotted lines in Fig. 4i.

4W hen the machine is started into operation, the rotation of shaft Gcarries with it the cam 55, which engages with the inside of the righthand end of yoke 53, and thereby the rod or bar 50 is pushed to theright. This disengages the. notch or latch 32 from detent 33, and theguard 15 falls immediately to the closed or safe position of Fig. 1. Asthe latch lever 29 moves upwardly duc to the fall of guard 15, spring 35draws .the bottom end S-- of the latch lever over and upon tho end 51 ofbar 50. thereby locking the guard in closed position. The bail 61 alsodrops into the recess between the lugs 56 and 57, thereby holding thebar 50 in locked position.

If it be attempted to manually unlock the mechanism while the extractoris rotating,

revolution of the shaft 6 pushing the bar 50 to the right or ratherpreventing its being moved to the left. lt will be understood that thelatch lever will remain iu the position of Fig. 1 until the guard 1.5 israised by hand.

After shaft G has come to rest, by moving lever 62, locking-bail 61 islifted out of its recess between lugs 5G and 57, and bar 50 is drawn tothe left from the position of Fig. 1 to the position of Fig. 2, that is,from the full line position of Fig. l to the dotted line positionthereof. After this is done, the guard 15 may be lifted, whereupon thelatch lever 29 will move Vfrom the position of Fig. 1 to that of Fig. 2and notch S2 willV engage detent 33, and thereby will loci-r the guard15 in raised or open position until the basket and its shaft are againVstarted into rotation. i

In accordance with one feature of Vthe invention automatic locking meansare provided for holding the latch lever 29 :in locking position for theclosed guard 15 rel- Cil atively to the locking barl), that is, meansfor preventing the latch lever being forcibly pried off the end of bar50. Normally, this addition locking means will not be necessary, but maybe provided when desired. ln Vthe present embodiment, said locking meansis itself automatically locked by the movement to the right of the bar50 to the position of Fig. l, said means automatically unlocking whenthe bar 50 moves to the left to the position of Fig. 2.

ln the emboddied form of such means, a latch l0 lies substantiallyhorizontally within a slot lll which is formed in the right-hand end ofthe bai" 50, the latch being pivoted on a pin i12, mounted in the bar5U. The latch 110 normally rests upon a pin 73 extending across thebottom part of the slot lll. The latch 110 is provided with a lockingface 7a, and whenthe latch is resting upon the pin 73, the upper surface75 of this latch is Hush with the beveled end 51 of the bar 50. Gn theunder side of the latch il() is a projection 76 which rides in a groove77, formedv in and `extending downwardly from the under side of theopening vin the frame piece 39 in which the bar 50 reciprocates.

rihe manner of operation of the locking device just described issubstantially as follows:

Then the bar is at the left-hand position,

as shown in Fig. l, latch ll() rests on pin.

73, and the surface 7 5 of the latch is flush with the surface 5l of thebar. As bar 50 slides to the right to the position shown in Figs. l and5, the latch 110 will slide beneath the bottom end of the latch lever-29. Just after the face 7d has passed the end of the latch lever 29,projection 76 rides up-l wardly on the right-hand end of the 'groove 77,thereby lifting latch 110 into the position shown. in Fig` 5. In thisposition of the latch it would be impossible to pry the latch lever 29off the end 5l of the bar 50. Then bar 50 is slid back to the left fromthe position of Figs. l and 5 to the position of Fig. 2, projection 76will ride downwardly in groove' 77, and latch 110 will drop bach on pin73 and ride beneath the end of latch lever 29, permitting the latchlevez to move downwardly to the position of Fig. 2 when the guard l5 isswung upwardly.

ln Figs. 6 to l0 a different form of lecto ing, device for the bar 50 tohold it in the right hand position of Fig. 2 is provided, which may besubstituted for the corre spending mechanism shown in Figs. l, 2 and ll.These two mechanisms are alternative exemplary embodiments and arenotrestrictive of the invention. This form of locking means cooperatesdirectly with devices on the basket shaft 6, said means locking directlyand automatically as shaft 6 begins to rotate andfpushes bar 50 to theright from the vposition of Fig. 2 to the position of Fig. l, but can bedisengaged or unlocked only after shaft 6 has come to rest.

ln theembodied form of such means, i collar 80 is mounted on the shaft 6or on the hub 5ft of the pulley 7 4to rotate therewith. Thek collar v8Ois cut out into an annular recess 81 ony its upper inner part,

facine on the shaft 6 or pulley hub 54;, and

on its upper outer surface the collar is upwardly and inwardly beveledas shown at 82. The collar 80 is provided with a recess 83 in its outervertical wall or periphery. J ust beneath the collar 8O is an annulardisc Sli loosely encircling the pulley hub 54, resting `upon an annularring 69 fixed on hub This disc has a recess S5 in its outer part orperiphery.

Means are provided for resiliently holding the disc Se relatively to thecollar 8O so as to maintain therecesses or slots and out of alinementwith each other` As embodied, such means comprises a spring S6 havingone end fastened to a pin 87, fixed in the collar 80, and having itsother end fastened to a pin 88, fined inthe upper side of the disc 84.Two pins 89 and 90 project horizontally outwardly from the cylindricalvertical wall of the collar 80 adapted to engage with pin 8,8 andthereby to limit the movement in both directions of the disc 84relatively to the collar 80. A finger piece 91 is fixed to the disc 84whereby it may be conveniently rotated by hand relatively kto the collar80.

l/Vheu spring 86 holds pin 88 on the dise against pin S9 on the collar,the recesses 83 and 85 are out of alinement, as shown in Figs, 6 and 7.When the disc 84 is pushed by finger piece 91 against the action ofspring 86v until pin 88 in the disc strikes pin 90 on the collar, therecesses or slots 83 and 85 will be in alinement as shown in Fig. 8. Thepurpose of normally maintaining the slots 8S and 85 out of alinement isto prevent the unlocking, of the locking means while shaft 6 is inmotion, and the purpose of bringing these slots into alinement is topermit the manual unlocking of the locking device after shaft 6 comes torest,

Referring now to the embodied form of locking means, abracket 94'ismounted on the upper side of bar 50, and a locking device 9:3 is fixedto a pin 99 journal-ed in the bracket 9d. The locking device 95comprises a spring hook 96 having its hooked or detented end 97 beveledon its forward side to engage with and to ride up on the surface 82 ofthe collar 80 to effect the automatic locking action. A rigid projection98de tends outwardly from the body of the locking device to guardagainst any possibility of the spring hook 96 being unwarrantedly pri-edupwardly or tampered. with to unlock the device when the shaft 6 isrotating, although this would be a difficult or impossible undertakingif this device were not used.

Projecting forwardly from the lower part of the locking device 95 is afinger 100, adapted to pass beneathV disc S4: and keep the device inlocked position except when the slots 83 and 85 are in register. A rigidtail 101 is fixed to the locking device 95 and projects backwardly fromthe pivot pin 99 and a coiled spring 102 is in compression beneath thetailV 101, between it and the upper side ofthe bar 50. A. handle 103 isfixed to the pin 99 whereby thc locking device may be manually.rocked tounlock the bar 50 to permit itsbeing moved to the left from the positionof Fig. 1 to that of Fig. 2 after the shaft 6 has come to rest. In Fig.9 Ithe side of the slot 65 is shown beveled or rounded at 104i and thetop edges of the finger 100 are shown correspondingly beveled at 105, sothat if by any chance linger 4 100 should be pressed upwardly into slot85 it would immediately bepressed downwardly again int-o its properposition beneath disc S4. The forward end of finger 100 is also shownbeveled at 106 to insure its passing smoothly under disc S11.

The manner of operation of the mechanism just described issubstantially' as follows z- As the shaft 6 begins to rotate, and thebar 50 is thereby moved by cam 55 yonthe basket shaft to the right `fromthe position of Fig. 2 to that of Fig. l, to release latch lever 29 fromthe detent 33,.to cause guard 15 to drop to closing position, theloc-king device 95willapproaoh the collar 80. `The spring hook 96 willride upwardly `on the beveled surface 82 of collar 80,- as shown in Fig.10, andassoon as the liook`96`has moved sufiiciently to the right, it`will snap down into the annular recess `81 in the'collar `S0v as Vshownin Fig.V 6: The bar 50 will `move suiiiciently to the right `to giveslight clearance between the hook `96 and the `vertical wall of therecess 81. i i

` During the movement -j ust described, the

pin 100 has passed beneath the disc 84- and thus prevents the device 95being rocked by the handle 103and so maintains the `bar Y 50 locked inthe right-hand or safe position.

The mechanism will be retained in this relation so long as shaft 6continues to rotate.

. Shaft 6 is broughtto rest'with the slot 63 in lin'ewith the finger100. By means of pin 91 the disc 84:1will be rotated against the pull ofspring 86 to move the disc from the position of Figl 7 to that of Fig. 8and thereby slots 83 and 85Jare brought into alinement.l Thereuponthehandle 103 may be pressed downwardly against the action of spring 102,and the bar 50 may be drawn to the left from the position of Fig. 1 tothat of F ig. 2, and the guard 15 may thereupon be raised.

The invention in .its broader aspects is not limited to the specificmechanismsshown and described but departures may be made therefromwithin the scope of the accom-` panying claims without departing fromthe principles of the invention and without sacrificing its chiefadvantages.

What I claim is 1. In combination in a centrifugal extractor a casing, abasket therewithin, a shaft extending downwardly from the basket, aguard for the open top of the casing hinged at a single place on theperiphery of the casing and supported to fall into closed position whenfree, means for holding the guard open and released by the basketbeginning to rotate to permit the guard to fall into closed position,means for preventing the reopening of the guard while the basketcontinues to rotate and manually operable means for releasing saidpreventing means after the basket has stopped rotating.

2. In combination in a centrifugal eX- tract-or a casing, a baskettherewitliin, a shaft extending downwardly from the basket, a guard forthe open top of the casing hinged at a single place on the periphery ofthe casing, means for holding the -guard open, means for releasing theholding means for allowing the guard to close upon the basket beginningto rotate, meansfor preventing the reopening of the `guard while thebasket continues to rotate and manually Yoperable means for releasingsaid preventing means after the basket tating.

3. In combination in a centrifugal eX- has stopped roftractor a casing,a rotatable basket 'there- .witliin, the basket andcasing having anunobstructed top opening, a guard movable to completely cover loruncover said opening,

and means operated by the basketstarting iio operable means forreleasingsaid preventing v means after the basket' has stopped rotating.

4. In combination in af centrifugal eX- tractor a casing,arotatablebasket therewithin, the basket and casing'havinganunobstructed top opening, a guard movable to completely cover oruncover said opening,

'and having a hinge mounted on the casing at the edge thereof, a latchlever connected to `and extending downwardly from the hinge, a shaftextending downwardly from the basket, and means operated by the shaftfor acting upon the latch lever to prevent the cover being raised whilethe shaft `and basket are rotating` and manually operable means forreleasing said preventing means after the shaft has come to rest.

5. In combination in a centrifugal c xtractor a basket, a shafttherefor, a guard therefor dropping by gravity to close the basketopening, a latch lever for holding the guard open and means operated bythe basket shaft for releasing the latch lever to permit the guard todrop to closing position upon the basket beginning to rotate and forlocking the latch lever and guard in basket closing position While thebasket continues to rotate.

6. In combination in a centrifugal eX- tractor a basket, a guarddropping by gravity to close the basket opening, a latch lever connectedto the guard and a cooperating detent for holdingr the guard in openposi-- tion, a shaft for the basket, means operated directly by thebasket shaft for releasing the latch lever from the detent as the shaftbegins to rotate to permit the guard to drop to closing position, andfor locking the guard and latch lever in closed position While the shaftcontinues to rotate.

7. In combination in a centrifugal eX- tractor a casing and a baskettherewithin, having an unobstructed opening, a hinge on the casing, aguard supported on the hinge to drop by gravity to close said opening, adetent, a latch lever pivoted to the hinge, a spring impelling the latchlever into engagement with the detent, a shaft extending downwardlyfromthe basket, a sliding bar adapted to release the latch lever from thedetent to permit the guard to drop and to engage the latch lever to lockthe guard in closed position, a cam on the shaft for sliding the bar torelease the latch lever as the shaft begins to rotate and to prevent theretraction of the bar from its locking position While the shaftcontinues to rotate. f 8. In combination in a centrifugal eX- tractor acasing and a basket therewithin, having an unobstructed opening, a hingeon the casing, a guard supported on the hinge to drop by gravity toclose said opening, a detent, a latch lever pivoted to the hinge, aspring impelling the latch lever into engagement with the detent, ashaft extending downwardly from the basket, a sliding bar adapted torelease the latch lever from the Y detent to permit the guard to dropand to engage the latch lever to lock the guard in closed position, acam on the shaft for sliding the bar to release the latch lever as theshaft begins to rotate and to prevent the retraction of the bar from itslocking position While the shaft continues to rotate, and

a locking device automatically locking the bar in locking position Withrespect to the latch lever but being manually releasable When the shaftcomes to rest.

9. In combination in a centrifugal extractor a basket guard, a latchlever holding the basket guard against gravity, a bar locking andunlocking the latch lever, and a member locking the latch lever and barin locking position.

10. In combination in a centrifugal extractor, a basket and casing, aguard therefor, a latch lever connected to the guard and extendingdownwardly along the basket, a bar slidable beneath the end of the latchlever to lock the guard in closed position and a member locking thelatch lever in lock-4 ing position on the bar.

11.y In combination in a centrifugal extractor a basket, aV shaft, abasket guard, lockingmeehanism for the guard including slidable bar, adetent collar on the shaftand a detent passing into locking engagementWith said collar when the bar is slid to locking position.

12. In combination in a centrifugal extractor a basket, a shaft, abasket guard, locking mechanism for the guard including a slidable bar,a detent collar on the shaft and a detent passing vinto locking engage'-ment with said collar When the bar is slid to locking position, saiddetent being manually movable to free it from the detent collar.

18. In combination in a centrifugal eX- tra-ctor a basket, a shaft, abasket guard, locking mechanism for the .guard including a slidable bar,adetent collar on the shaft and a detent passing into locking engagementwith said collar when the bar is slid to locking position, said detentbeing manually rockable to free it from the detent collar.

14. In combination in a centrifugal extractor a. basket, a shaft, abasket guard, locking mechanism forthe guard including a slidable bar, adetent collar on the shaft and a detent passing by spring action intolocking engagement with said collar when the bar is slid to lockingposition.

15. In combination in a centrifugal eX- tractor a basket, a. shaft, a.basket guard,

`locking mechanism for the guard including a slidable bar, a detentcollar on the shaft and a. detent passing by spring action into lockingengagement with said' collar when the bar is slid to loc-king position,said detent being manually movable tofree it from the detent collar.

16. In combination in a centrifugal er1-- tractor a basket, a shaft, abasket guard, locking mechanism lfor the guard including a` slidablebar, a detent collar on the shaft and a detent passingy by spring actioninto locking engagement with said collar when the bar is slid to lockingposition, said detent being manually rockable to free it from the detentcollar.

17. In combination in a centrifugal eX- tractor, a. basket, a shaft forthe basket, a guard for the basket, means, including a locking bar, forlocking the guard in closed position, and means carried by the basketshaft, operating independently of theshalt speed for positively movingthe locking bar to locking position as soon as the basket startsrotating.

18. In ,combination in al centrifugal eX- tractor, a basket, a shaft forthe. basket, a guard for the basket, means, including a looking bar, forlocking the guard in closed position, and eccentric means carried by thebasket sha-ft, for positively moving the lock- `ing bar to lockingposition as soon as the basket starts rotating.

19. In combination in. a centrifugal cxf tractor, a casing. a rotatable.basket, a guard dropping by gravity to close the basket opening andmeans for holding the guard in open position and for releasing ittherefrom, in cluding a slidable member and a locking latch thereforactuated by the rotation oi the basket.

20. In combination in a centrifugal extractor, a casing, a rotatablebasket, a guard dropping by gravity to close the basket opening andmeans for holding theguard :in open position and for releasing ittherefrom, and positively holding it in closed position, said meansbeing actuated by the rotation of the basket.

21. In combination in a. centrifugal extractor, a basket, a basketshaft, a guard tor the basket, a latch lever for the guard, a lockingbar for the latch lever, and means carried by the basket shaft,operatiha independently of the shaft speed for moving the locking barinto a position to lock the latch lever and guard in closed position, assoon as said shaft starts rotating. y

22. VIn combination in a` centrifugal eX- tractor, a basket, a basketshaft,a guard for the basket, a latch lever for the guard, a locking barfor the latch lever, and eccentric means carried by the basket shalt,for moving the locking bar into aposition to lock the latch lever andguardl in closed position.

23. In combination in a centrifugal extractor, a basket, a basket shaft,a guard for the basket, a latch lever for the guard,

a locking bar for the latch lever, and eccenf tric means carried by thebasket shaft for moving the locking bar intoa position for locking thelatch lever and guard in closed position, and for maintaining it in suchlocked position as long as the basket continues to rotate.

In testimony whereof, I have signed my name to this specification.

TANDY A. BRYSON.

